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Sat, 12 Sep 2026 12:49:54 +0000 (UTC) Received: from dovecot-director2.suse.de ([2a07:de40:b281:106:10:150:64:167]) by imap1.dmz-prg2.suse.org with ESMTPSA id AHlFF3JKpWqTGwAAD6G6ig (envelope-from ); Sat, 12 Sep 2026 12:49:54 +0000 From: Takashi Iwai To: linux-sound@vger.kernel.org Cc: linux-kernel@vger.kernel.org Subject: [PATCH RFC v2] ALSA: seq: Mark OSS sequencer emulation as deprecated Date: Sat, 12 Sep 2026 14:49:45 +0200 Message-ID: <20260912124951.416761-1-tiwai@suse.de> X-Mailer: git-send-email 2.55.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Spam-Level: X-Spam-Score: -2.80 X-Spam-Flag: NO X-Spamd-Result: default: False [-2.80 / 50.00]; BAYES_HAM(-3.00)[100.00%]; MID_CONTAINS_FROM(1.00)[]; NEURAL_HAM_LONG(-1.00)[-1.000]; R_MISSING_CHARSET(0.50)[]; NEURAL_HAM_SHORT(-0.20)[-0.995]; MIME_GOOD(-0.10)[text/plain]; RCPT_COUNT_TWO(0.00)[2]; RCVD_VIA_SMTP_AUTH(0.00)[]; ARC_NA(0.00)[]; DKIM_SIGNED(0.00)[suse.de:s=susede2_rsa,suse.de:s=susede2_ed25519]; DBL_BLOCKED_OPENRESOLVER(0.00)[imap1.dmz-prg2.suse.org:helo,suse.de:email,suse.de:mid]; TO_MATCH_ENVRCPT_ALL(0.00)[]; FROM_HAS_DN(0.00)[]; MIME_TRACE(0.00)[0:+]; FROM_EQ_ENVFROM(0.00)[]; TO_DN_NONE(0.00)[]; RCVD_COUNT_TWO(0.00)[2]; RCVD_TLS_ALL(0.00)[] Content-Type: text/plain; charset="utf-8" OSS sequencer API emulation has been implemented as a client of ALSA sequencer, decades ago, at the time where OSS was still use. But the API itself became very niche, and almost noone using it for a real purpose any longer -- only exceptions are AI and fuzzers, who have been causing significant maintenance burden for issues they hit & found. Meanwhile, the most features of OSS sequencer API emulation can be achieved in user-space, either by ALSA-OSS layer (aoss) or oss-seq-emu program: https://github.com/alsa-project/alsa-oss https://github.com/tiwai/oss-seq-emu where the former is LD_PRELOAD wrapper and the latter is a CUSE-based daemon. So we can drop the stuff from the kernel sooner or later. Now, let's mark the OSS sequencer emulation as deprecated and give a warning when loaded, so that we can drop it later actually. Signed-off-by: Takashi Iwai --- v1->v2: put the warning for snd-seq-oss at the right place sound/core/seq/Kconfig | 7 +++++-- sound/core/seq/oss/seq_oss.c | 3 +++ 2 files changed, 8 insertions(+), 2 deletions(-) diff --git a/sound/core/seq/Kconfig b/sound/core/seq/Kconfig index e4f58cb985d4..0d606159103e 100644 --- a/sound/core/seq/Kconfig +++ b/sound/core/seq/Kconfig @@ -27,14 +27,17 @@ config SND_SEQ_DUMMY will be called snd-seq-dummy. =20 config SND_SEQUENCER_OSS - tristate "OSS Sequencer API" + tristate "OSS Sequencer API (deprecated)" depends on SND_OSSEMUL select SND_SEQ_MIDI_EVENT help Say Y here to enable OSS sequencer emulation (both /dev/sequencer and /dev/music interfaces). =20 - Many programs still use the OSS API, so say Y. + The OSS sequencer API is almost nowhere used, hence this option will + be dropped soon. + Use user-space wrapper (alsa-oss) or CUSE daemon (oss-seq-emu) + instead of the kernel-side emulation. =20 To compile this driver as a module, choose M here: the module will be called snd-seq-oss. diff --git a/sound/core/seq/oss/seq_oss.c b/sound/core/seq/oss/seq_oss.c index 2835576040ed..64a7e62029cc 100644 --- a/sound/core/seq/oss/seq_oss.c +++ b/sound/core/seq/oss/seq_oss.c @@ -67,6 +67,9 @@ static int __init alsa_seq_oss_init(void) { int rc; =20 + pr_warn("seq-oss: kernel OSS sequencer emulation is deprecated\n"); + pr_warn("seq-oss: Use user-space solution (alsa-oss or oss-seq-emu) inste= ad.\n"); + rc =3D register_device(); if (rc < 0) goto error; --=20 2.55.0